12 
VARIATION IN SUPRALABIALS. 
The normal condition is to have 7 supralabials with the 
III entering the eye. When the number is increased to 8 it 
is due to the normal V shield being divided. When the count 
is decreased to 6 it is not known what shields are fused or sup- 
pressed to bring it about. 
Examples. Normal. Asymmetrical. Bilateral. 
ie 8 
Otal. INUMDCE svi tus Hee cnr ans «6 118 97 13 8 
Central Asia) oF) fsa ved ays 10 2 3 5 
Ussaurl Province wie. crv iek 13 6 4 2 
Ange ae peer ae Ve eer eRe 25 21 3 i 
WING pi este eee es eel pale 29 at 2 
BinHe inet arere Sore eRe area aera 41 40 1 
It is evident that in specimens from the mainland along 
with their larger size there is an increase in the number of 
seale rows around the anterior half of the body and a tendency 
for an increase in the number of supralabial shields. 
VARIATION IN INFRALABIALS. 
The normal condition is to have 10 infralabial shields. 
Where the number is increased to 11 it is due to the normal 
VII shield being divided. Where the count is decreased it is 
usually due to the fusion of the normal II and III shields, but 
may be brought about by the fusion of the I-and II, or the 
VII and VIII shields. 
hx - In- Asymmet- Nor- Asymmet- De- 
amples. creased. rical. mal. rical. creased. 
11 11-10 10 10-9 9 
Total Number vscversnncera 59 5 16 31 4 3 
Useurt Province -s..c.ss 2 - ; 1 1 - 
IOP Cte oes re rie ke ne 19 2 5 ff 2 3 
CHING cigs sce y iy nten eae + 20 2 3 15 F 
VOPAN wees Pea eerie 18 i 8 8 1 
It may be instructive to compare the count of the labial 
shields in Hebius vibakari (Boie) 1826, (1) which occurs in 
the Ussuri Province, Korea, and Japan, 
The supralabial shields are normally 7, with the third and 
fourth entering the eye. When the number is increased to 8, 
it is by the addition of a shield between the normal II and III, 
and is referred to as Ila; in actual counting the fourth and 
fifth enter the eye. When the number is decreased to 6, it is 
due to the fusion of the normal III and IV shields; by actual 
count it is the third that enters the eye. 
(1) 1913, Thompson, Proc. Zool. Soc., Loudan Il, p. 424. 
